National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

49°F

9°C

Humidity 74%
Wind Speed S 12 mph
Barometer 29.92 in (1013.5 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 7 Jan 5:54 pm CST
Extended Forecast for

Decatur Airport IL

  • Tonight

    Tonight: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 41. South wind 9 to 11 mph, with gusts as high as 22 mph.

    Low: 41 °F

    Mostly Clear
    then Patchy
    Fog

  • Thursday

    Thursday: Showers likely, mainly after noon. Patchy fog before 10am. Otherwise, cloudy, with a high near 62. Breezy, with a south southeast wind 13 to 20 mph, with gusts as high as 36 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 62 °F

    Showers
    Likely and
    Patchy Fog

  • Thursday Night

    Thursday Night: Rain and possibly a thunderstorm before 3am, then rain likely. Low around 49. Breezy, with a south wind 14 to 22 mph becoming west southwest after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 49 °F

    Rain and
    Breezy then
    Rain Likely

  • Friday

    Friday: Mostly cloudy, with a temperature falling to around 46 by 5pm. West southwest wind 9 to 14 mph becoming north in the afternoon. Winds could gust as high as 22 mph.

    High: 55 °F⇓

    Mostly Cloudy

  • Friday Night

    Friday Night: A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 37. Northeast wind 6 to 9 mph.

    Low: 37 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday

    Saturday: A chance of rain before noon, then a chance of rain and snow. Cloudy, then gradually becoming mostly sunny, with a high near 41. West northwest wind 10 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 40%.

    High: 41 °F

    Chance Rain
    then Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 21. West wind 15 to 17 mph, with gusts as high as 25 mph.

    Low: 21 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 31.

    High: 31 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 21.

    Low: 21 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 41. South wind 9 to 11 mph, with gusts as high as 22 mph.
Thursday
Showers likely, mainly after noon. Patchy fog before 10am. Otherwise, cloudy, with a high near 62. Breezy, with a south southeast wind 13 to 20 mph, with gusts as high as 36 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Rain and possibly a thunderstorm before 3am, then rain likely. Low around 49. Breezy, with a south wind 14 to 22 mph becoming west southwest after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Mostly cloudy, with a temperature falling to around 46 by 5pm. West southwest wind 9 to 14 mph becoming north in the afternoon. Winds could gust as high as 22 mph.
Friday Night
A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 37. Northeast wind 6 to 9 mph.
Saturday
A chance of rain before noon, then a chance of rain and snow. Cloudy, then gradually becoming mostly sunny, with a high near 41. West northwest wind 10 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 40%.
Saturday Night
Mostly cloudy, with a low around 21. West wind 15 to 17 mph, with gusts as high as 25 mph.
Sunday
Partly sunny, with a high near 31.
Sunday Night
Mostly clear, with a low around 21.
Monday
Mostly sunny, with a high near 41.
Monday Night
Partly cloudy, with a low around 29.
Tuesday
Partly sunny, with a high near 46.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A chance of rain. Mostly cloudy, with a high near 39.
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur Airport IL
 39.84°N 88.88°W (Elev. 650 ft)
Last Update:
6:36 pm CST Jan 7, 2026
Forecast Valid:
6pm CST Jan 7, 2026-6pm CST Jan 14, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation